onomatopoeic word to describe the sound of milk or some other beverage coming out your nose from attempting not to laugh.

Vagrant: Sir, could you spare a quarter?
Citizen with latte: Sorry, I don't have any cash. (sips drink)
Vagrant: So you want to do a debit?
Citizen: Bchork!
Vagrant: Are you okay? I can call an ambulance if you've got a quarter.
Citizen: Bchork!